Roasting-furnace.



F. E. MAROY.

ROASTING FURNAGE.

APPLIOATION FILED MAB. zo, 1909.

Patented May 11, 1909.

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BY zffaub A TTOR NE Y.

fully set forth in ing my invention, I

C in medium for 4UNITED sTATEs PATENT OFFICE.

FRANK E. MARcY, or `SALT LAKE cITY, UTAH, As'sIGNoR To FRANK 'KLEPETKQ or NEW YORK, N. Y.

ROASTING-FURNACE To all 'whom 'it may concern:

Be it known that I, FRANK/E. MARCY, av citizen of the 'United States', 'residing at Salt Lake City,'in the county of Salt Lake and State of Utahyhavejni-'ented certain new and useful Improvements in Roasting- Furnaces, of which the following is a full, clear, andexact description, reference being had to the accompanying drawings, forining a part hereof., y j My invention has relation vto improvements in roasting-furnaces'; and it consists in the novel details of construction more the specification and pointed ont in the claims. In the drawings, Figure l is a vertical middle section and part elevation of a ortion of a-rabble-shaft and arms constitut# and showing its application to a roasting furnace; Fig. 2 is an enlarged vertical section on line 2 2 of Fig. 3 showing the connection between the shaft and rabble-arm, and showing one form of my invention; Fig. 3 is a cross-section on line 3-3 of. Fig. 2; Fig. l is a horizontal section online 4 4 of Fig. 3; Fig. 5 is a' sectional detail on the order of Fig. 2 showing a modified construction; and Fig. 6 is a similar section showingstill another modification. n, The object of my invention is to provide an air jacket for the rabble-shaft uand rab-l ble-arms of roasting furnaces, especially for rabbles used in the treatment of ores whose fuel contents is so proportioned that an abnormalabsorption of the heat units generated by its combustion, by the cooling medium circulatingA through the shaft and arms becomes detrimental to the4 successful operation of the furnace. v f Infurnaces employing water asa circulatthe rabble-shaft'and arms, be ore the necessary cooling of the rabble apparatusl can be effected, the water must necessarily abstract so large a percentage of. heat ,units from the'charge, that an undue reduction `of temperature results, and the roasting becomes incomplete. My present arrangement contemplates the interposition between the parts throu h Which'the ,water circulates and the ore, oa jacket of air, so.

.that the water ,will notcome in direct contact with the walls which are in immediate vcontact with the charge. This arrangement will necessarily cut down the amountof Specication of Letters Patent.

, Application led Hatch 20,

furnace indotted .of its wat-er two ac'kets having Patented May 11, 1909. 1909. Serial N0. 484,737.

water used on account of the heat non-conducting qualities of the interposed air envelop 0r jacket and consequently increase the capacity of the furnace. At the ,same time the walls of the rabble apparatus are kept sufficiently cool'to prevent sagging4 and deterioration from the heat to which they are subjecteddn the furnace.

In detail the invention may be described Referring to the drawings and particu-` larly to Figs. 1 to 4; inclusive, F represents a outline, being of a' conven-v tional type and well understood. The hearths are represented by z, the materi'alorcharge dropping Ifrom one hearth to the next hearth below as is well understood in the art. Passing through the several hearths. is the rota` table hollow rabble-shaft l, from which radiate the series of hollow arms2 extending into the several hearths and carrying rakes 3 by which the material is successively fed from one hearth to the hearth immediately beneath it, all as fullycunderstood in the art. Circulation. through the hollow shaft and arms of a suitable cooling lmedium (preferably water) may be effected in any Way known to the art; and in the drawings I .have shown in dotted outline a water-feed pipe El havingdistributin pipes 5 leading opening into the hollow arms .from which the water is discharged and passing through the arms flows back into the shaftaround the pipe 4f and eventually l'up andout through the shaft. rI his method of circulation, however, is well understood and is merely cited here as one of,k the many that might be resorted to, togeliect cooling of the rabble ap aratus. Formedbetween lthe exterior wa l of the shaft and the wall ofthe passage through which the water circulates is an air jacketgand formed between the exterior wall of the rabble arm and the wall passage is an air-jacket f7, vthe no interconimunication in: the forms `shown inyFigs. l to 4 inclusive, since it is desirablel and preferable to keep the uter wall of the hub orboss l lto, which the arm isattached, water cooled, as most lstrength'must be centered in ,this particular member..l 1 I I Inv the modification shown in Fig. 5, the

air-,jacket ,6 is continued around the hub in the form of an extension 6";'but's`eparated vfrom the jacket7fofthe rabble arm. In the;

icc

with the jacket 7 of the arm.

ications may be used where the heat develmodification shown in Fig. 6 the air-jacket 6'. of thek hub is in direct communication These modi- 4oped -in the charge is not too great to have any detrimental effect on the hub. Y For the majority of cases in constructlons I' A of the character here described, the water or air-jacket is not in communication lwitli the v equivalent cooling medium abstracts Sullicient heat units from the rabble apparatus to keep the same at a sufficiently low' temperature to resist the disintegrating and destructive eiects of the heat of the furnace.v T e air-jacket of course acts as an' intercepti g layer between the' water' and the heated products of the furnace, thus preventing the water from abstracting the heat units of the charge v to a point ,where the, furnace ceases to give properresults. Where the innerl cooling-and circulating medium is water, of coursethe interior passagesof the rabble shaftor arms;

but wherel air is employed' the air-jacketsI may, be made to communicate with such inner assages, though not necessarily.

, Of course I do not wish to restrict the application of the rabble apparatus to oreroasting furnaces as it may be employed in 'any art where it can find suitable application. ,Having described. my invention, what I claim is y 1. Ina furnace, a hollow rabble-shaft' 4through which is adapted to lcirculate av .cooling medium, andan air jacket forming the enveloping walls of said shaft, substantially as set forth.

2'. In a furnace, a hollow rabble-shaft andvhollowarms4 therefor, means for circulating a cooling medium therethrough,

and-outer air-jackets enveloping the shaft and arms respectively, substantially as set rabblevapparatus comprising a hollow` shaft and hollow A,arms radiating there- I from, meansfor circulating a cooling medium through said shaft and arms, and airjackets enveloping the passages of the shaft and. arms but not in communication theregwith, substantiallyfas set forth.

4. A rabble apparatus comprising a hollow shaft and hollow arms radiating therefrom for the circulation of a cooling medium, and an air-jacket enveloping the passages of said shaft and arms, the jackets of the armsbeing in communica-tion with the jacket of the shaft, substantially as set forth.

5. A rabble apparatus .comprising a hollow shaft and ollow arms radiating therel l from for'` the circulation of water therethrough, and air jackets separating the walls with which the water contacts, from direct contact with the furnace charge, substantially asset: forth.

armhaving an outer air-j et, substantially 6. In Aay rabble apparatus'ia hollow rabble l ac 'as set forth. .f

7 In a rabble apparatus, a hollowr rabble arm having an air-jacket ,enveloping the same, but not in communication with the.

. FRANK. E. MARCY.

l Witnesses: f

J. FLETCHER, Jr. A. RICHTER. 

